Gun engine testing v2.5

To start a game press the flag, once you die, press the flag again to begin a new game!

Changelog v2.5:
Added damage to the guns and life to the zombies
Added a health bar
Minor bug fixes

Changelog v2:
Edited the gun system heavily
Added the possibility to switch to a different gun
Scripted the zombie AI

Keybinds:
W = Forward
A = Left
S = Back
D = Right
Hold left click = shoot